<!DOCTYPE html >
 <head>
  <meta charset="UTF-8"/>
  <title>Jquery遮罩层</title>
  
  <style type="text/css">      
      #BgDiv{background-color:#e3e3e3; position:absolute; z-index:99; left:0; top:0; display:none; width:100%; height:1000px;opacity:0.5;filter: alpha(opacity=50);-moz-opacity: 0.5;}
      
      #DialogDiv{position:absolute;width:400px; left:50%; top:50%; margin-left:-200px; height:auto; z-index:100;background-color:#fff; border:1px #8FA4F5 solid; padding:1px;}
      #DialogDiv h2{ height:25px; font-size:14px; background-color:#8FA4F5; position:relative; padding-left:10px; line-height:25px;}
      #DialogDiv h2 a{position:absolute; right:5px; font-size:12px; color:#000000}
      #DialogDiv .form{padding:10px;}
      
      #DialogDiv2{position:absolute;width:400px; left:50%; top:50%; margin-left:-200px; height:auto; z-index:100;background-color:#fff; border:1px #8FA4F5 solid; padding:1px;}
      #DialogDiv2 h2{ height:25px; font-size:14px; background-color:#8FA4F5; position:relative; padding-left:10px; line-height:25px;}
      #DialogDiv2 h2 a{position:absolute; right:5px; font-size:12px; color:#000000}
      #DialogDiv2 .form{padding:10px;}
      
      #DialogDiv3{position:absolute;width:400px; left:50%; top:50%; margin-left:-200px; height:auto; z-index:100;background-color:#fff; border:1px #8FA4F5 solid; padding:1px;}
      #DialogDiv3 h2{ height:25px; font-size:14px; background-color:#8FA4F5; position:relative; padding-left:10px; line-height:25px;}
      #DialogDiv3 h2 a{position:absolute; right:5px; font-size:12px; color:#000000}
      #DialogDiv3 .form{padding:10px;}
  </style>
  
  <script language="javascript" type="text/javascript" src="js/jquery-1.9.0.min.js"></script>
  <script language="javascript" type="text/javascript">
      function ShowDIV(thisObjID) {
          $("#BgDiv").css({ display: "block", height: $(document).height() });
          var yscroll = document.documentElement.scrollTop;
          $("#" + thisObjID ).css("top", "100px");
          $("#" + thisObjID ).css("display", "block");
          document.documentElement.scrollTop = 0;
      }

      function closeDiv(thisObjID) {
          $("#BgDiv").css("display", "none");
          $("#" + thisObjID).css("display", "none");
      }
 </script>
  
 </head>
 <body>
  <div id="BgDiv"></div>
  
  <!--遮罩层显示的DIV1-->
  <div id="DialogDiv" style="display:none">
    <h2>弹出层<a href="#" id="btnClose" onclick="closeDiv('DialogDiv')">关闭</a></h2>
   <div class="form">我是弹出对话框111111！！</div>
  </div>
  
  <!--遮罩层显示的DIV2-->
  <div id="DialogDiv2" style="display:none">
    <h2>弹出层<a href="#" id="btnClose2" onclick="closeDiv('DialogDiv2')">关闭</a></h2>
   <div class="form">我是弹出对话框2222！！</div>
  </div>
  
  <!--遮罩层显示的DIV3-->
  <div id="DialogDiv3" style="display:none">
    <h2>弹出层<a href="#" id="btnClose3" onclick="closeDiv('DialogDiv3')">关闭</a></h2>
   <div class="form">我是弹出对话框3333333！！</div>
  </div> 
  
  <p>
   <input value="弹出遮罩层1" type="button" id="btnShow1" onclick="ShowDIV('DialogDiv')" />
   <input value="弹出遮罩层2" type="button" id="btnShow2"  onclick="ShowDIV('DialogDiv2')" />
   <input value="弹出遮罩层3" type="button" id="btnShow3"  onclick="ShowDIV('DialogDiv3')" />
  </p>
 </body>
</html>
